Hey guys...my check engine light came on and I checked and got codes 0304 (knock sensor) and 0213 (EVAP small leak). Last time I had a knock sensor and Evap leak it was the gas cap. Recently, I changed my oil cap and brakework done...so anyone ever had these codes come up...or have any idea what it might be? It's nice outside so I guess I'm just gonna have to check all my evap hoses to see if anything is worn out or loose. thanks for any help

 

The KS won't give a CEL but it will register an error code that shows when something else goes bad.
You may have a bad KS or just a flaky connection to it AND an EVAP problem.